Wii messing up after softmodding...

So I softmodded my parents wii last weekend using any wii softmodded guide and all was working well. Today my mom called me and said that the past couple days the wii had been locking up, not able to play some games and if the games do play u can only play them so long until the wii sorta locks up and the only way to turn it off is to unplug it. I used an 8gb sd and an 8gb usb flash drive to backup the games they already had, since my mom babysits a lot and doesn't want the wii discs to get scratched up. Does anyone know why this is happening and what I can do to fix it? Also their wii wouldn't let me watch a DVD through the media player like my gfs softmodded wii and I couldn't figure out why.

Usually, that's a very bad sign. The system could've scrambled it, but that's a common error report for a drive gone bad (I have one just like it sitting by the TV gathering dust). Click (presuming Windows 7) Control Panel. Then click Administrative Tools. Then click Computer Management. When it loads, select Disk Management under Storage. See if you can (presuming nothing worried about on the drive) rectify it there.